I feel we're at a point where we need to step back and consciously remind ourselves that posting ANYTHING personal online is a risk. It should be a calculated one.
Companies that run major websites HAVE to stay above board with the law, no matter how shit that law is, unless they're small enough to just dissolve and hide and pop up again under a different name later (usually meaning sole proprietorships) or big enough to be granted an unofficial "yeah we'll just look the other way because we want that sweet sweet lobbyist money" exception (in which case it's usually NOT gonna be the shit laws they're breaking). Meaning you should REALLY think twice about posting about anything illegal, and you should NOT be shocked when posts recommending illegal activity get nuked from a semi-major website.
This also means that if you're on a platform that's not DESIGNED for privacy - which, in many cases, includes the implicit purpose of enabling breaking certain laws the platform creators think are stupid, though they can't admit to it (just like how you can sell bongs in states where weed is still illegal but you have to SAY they're "for tobacco use only") - you have to operate under the assumption that ANYTHING you say can be intercepted and monitored. Again - unless the platform is explicitly there for privacy, unless your communication is end-to-end encrypted, unless the cops have reason to understand and believe that the logs don't EXIST, assume ANY platform host will hand over a complete log of everything you've said there and where you said it from to the cops upon request.
In addition, posting publicly about things that are typically protected by certain privacy laws can undermine the protection from those laws. "Reasonable expectation of privacy" is a legal term. You have it with things you say in private in your home. You have it to an extent with quiet conversations you have with a friend at a coffee shop. You DON'T have it with things you scream on a public street - and you DEFINITELY don't have it with things you post online with your legal name and actual human face attached.
I say this, because for the past few years I've noticed a disturbing trend of people assuming this is a uniquely bad EXCEPTION to a general free-for-all, and not...the rule. This is the default! This isn't a uniquely evil thing about Facebook or Twitter or Discord or anywhere else! It's not a "tumblr is secretly betraying us right under our noses" thing! This is just the reality of operating a website under the legal systems that exist! Even if it's a site whose operators' internal values are truly aligned 100% with yours, you STILL have to assume they're going to sing like a canary because, come on, do you really expect them to sacrifice themselves over one (1) user? Maybe a tiny forum of friends would, but no company is going to do that.
And that's not even getting into what happens when it's not a host/operating company or organization, but just some individual asshole other user with an axe to grind.
Tl;dr remember that We Live In A Society, stop expecting people and companies not to cover their asses, be careful about what you share online, and learn to use actual encrypted services. Sure, Facebook and other shitty entities like to pretend the internet is a super cool safe playground where all but doxxing yourself does more good than harm, but they're blatantly fucking lying. Talking about your disabilities is a risk. Talking about being queer is a risk. Talking about anything that might become illegal in your area is a risk. CALCULATE THOSE RISKS BEFORE YOU TAKE THEM instead of doing the shocked Pikachu face when your post of detailed instructions for how to firebomb a police station gets taken down and you get put on a list because you left it perfectly traceable to your real identity.
